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Stirling engine

a technology of rotating engine and rotating shaft, which is applied in the direction of engine components, hot gas positive displacement engine plants, machines/engines, etc., to achieve the effects of low pressure drop, high thermal stability and fatigue strength, and efficient heat exchang

Active Publication Date: 2021-02-25
MASTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is for a Stirling engine that uses metal foam as a regenerator to efficiently exchange heat with the working gas. The foam has high thermal stability and fatigue strength, and is rigid without getting compressed under high gas pressures. The design of the regenerator promotes easy mounting and exchange. The metal foam has a large effective contact surface for the gas to exchange heat through. The regenerator element is made of a matrix with closed porosity that allows for rapid exchange of heat without excessive heating of the matrix. The regenerator element has lower hydraulic porosity in the end exposed to higher temperatures to ensure mechanical strength. The matrix has lower porosity in the region exposed to larger heat fluctuations and temperatures to increase heat absorption capacity.

Problems solved by technology

Accordingly it is a challenge to design a regenerator that fulfils all these requirements.

Method used

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Embodiment Construction

[0033]FIGS. 1-3 show an example of a Stirling engine according to the present disclosure. The Stirling engine shown is of gamma type and comprises a crank case 1 with a crank shaft 2 arranged therein, and a displacer cylinder 3 with a reciprocatingly arranged displacer piston 4 therein. The displacer piston 4 is connected to the crank shaft 2 via a connecting rod 5 extending through a first end of said displacer cylinder 3. During operation of the Stirling engine, the displacer cylinder 3 defines a hot chamber 6 and a cool chamber 7 separated by the displacer piston 4.

[0034]The Stirling engine further comprises a working cylinder 8 with a reciprocatingly arranged working piston 9 therein, said working piston 9 being connected to the crank shaft 2 via a connecting rod 10 extending through a first end of the working cylinder 8. A working cylinder chamber 11 defined by the working cylinder 8 is divided by the working piston 9 into a first part 12, through which said connecting rod 10 e...

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Abstract

A Stirling engine comprising:a crank case (1) with a crank shaft (2) arranged therein,a displacer cylinder (3) with a reciprocatingly arranged displacer piston (4) therein, said displacer piston (4) being connected to said crank shaft (2) via a connecting rod (5) extending through a first end of said displacer cylinder (3), and wherein the displacer cylinder (3) defines a hot chamber (6) and a cool chamber (7) separated by the displacer piston (4),a working cylinder (8) defining a working cylinder chamber (11) with a reciprocatingly arranged working piston (9) therein, said working piston (9) being connected to said crank shaft (2) via a connecting rod (10) extending through a first end of the working cylinder (8),a heater device (14), arranged at a second end of said displacer cylinder (3) opposite to said first end and configured to heat a working gas which is present in the hot chamber (6) of the displacer cylinder (3) and in fluid communication with the working cylinder chamber (11) through a working gas channel which comprisesa first heat exchanger (16) extending from a head (19) of the displacer cylinder (3) into the heater device (14), anda second heat exchanger (17) formed by a regenerator arranged outside the heater device (14). The regenerator (17) comprises a regenerator element (17) formed by metal foam that has an open porosity.

Description

TECHNICAL FIELD[0001]The present invention relates to a Stirling engine comprising:[0002]a crank case with a crank shaft arranged therein,[0003]a displacer cylinder with a reciprocatingly arranged displacer piston therein, said displacer piston being connected to said crank shaft via a connecting rod extending through a first end of said displacer cylinder, and wherein the displacer cylinder defines a hot chamber and a cool chamber separated by the displacer piston,[0004]a working cylinder defining a working cylinder chamber with a reciprocatingly arranged working piston therein, said working piston being connected to said crank shaft via a connecting rod extending through a first end of the working cylinder,[0005]a heater device, arranged at a second end of said displacer cylinder opposite to said first end and configured to heat a working gas which is present in the hot chamber of the displacer cylinder and in fluid communication with the working cylinder chamber through a working...

Claims

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Application Information

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IPC IPC(8): F02G1/057
CPCF02G1/057F02G2257/00F02G1/043
Inventor MASTONSTRÅLE, STEFAN
Owner MASTON
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